Wed·Nov 4, 2020Wednesday·November 4, 2020

1. 01*

   Uncovering Majorana nature through a precision measurement of $CP$ phase

   J.C. Carrasco-Martínez🇵🇪 · F.N. Díaz🇵🇪 · A.M. Gago🇵🇪

   We show the possibility to discover the neutrino nature by measuring the Majorana CP phase at the DUNE experiment. This phase is turned on by a decoherence environment, possibly originated by physics at the Planck scale. A sizable distortion in the measurement of the Dirac CP violation phase ${\delta }_{\mathrm{CP}}$ is observed at DUNE when compared with T2HK measurement due to decoherence and non-null Majorana phase. Being that, when the measurement of the Majorana phase is performed at DUNE, it reaches a precision of 23 (21) $\%$ for a decoherence parameter $\Gamma =4.5(5.5)\times 10^{-24}\mathrm{GeV}$ and a Majorana phase equal to $1.5\pi$. The latter precision is similar to the one obtained at the T2K experiment at its current Dirac CP violation phase measurement.

   hep-phPRD(2022)·14 citations
2. 02*

   Neutrino 2020: Theory Outlook

   Goran Senjanovic🇮🇹

   I present a personal vision of what is essential in the field of neutrino mass, both from the point of view of what has been achieved and what could lie ahead. In the process, I offer a logical, theoretical and phenomenological rationale behind my opinions. It is however neither a summary of what was discussed in the conference nor a party-line viewpoint, rather an attempt to dig through the enormous body of material in our field in order to uncover a common unifying thread. The main focus is on the search for a predictive and self-contained theory of the origin and nature of neutrino mass, with the conclusion that the Left-Right Symmetric Model plays a special role in this aspect.

   hep-phhep-exInt.J.Mod.Phys.A(2021)·10 citations
3. 03*

   Axion Searches with Two Superconducting Radio-frequency Cavities

   Christina Gao🇺🇸 · Roni Harnik🇺🇸

   We propose an experimental setup to search for Axion-like particles (ALPs) using two superconducting radio-frequency cavities. In this light-shining-through-wall setup the axion is sourced by two modes with large fields and nonzero $\vec{E}\cdot \vec{B}$ in an emitter cavity. In a nearby identical cavity only one of these modes, the spectator, is populated while the other is a quiet signal mode. Axions can up-convert off the spectator mode into signal photons. We discuss the physics reach of this setup finding potential to explore new ALP parameter space. Enhanced sensitivity can be achieved if high-level modes can be used, thanks to improved phase matching between the excited modes and the generated axion field. We also discuss the potential leakage noise effects and their mitigation, which is aided by O(GHz) separation between the spectator and signal frequencies.

   hep-phhep-exJHEP(2021)·26 citations
4. 04*

   Numerical simulation of dark atom interaction with nuclei

   T.E. Bikbaev (1)🇷🇺 · M.Yu. Khlopov (1, 2 and 3)🇷🇺 · A.G. Mayorov (1) ((1) National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia, (2) Institute of Physics, Southern Federal University, Rostov on Don, Russia, (3) Université de Paris, CNRS, Astroparticule et Cosmologie, Paris, France)🇷🇺

   The old and still not solved problem of dark atom solution for the puzzles of direct dark matter searches is related with rigorous prove of the existence of a low energy bound state in the dark atom interaction with nuclei. Such prove must involve a self-consistent account of the nuclear attraction and Coulomb repulsion in such interaction. In the lack of usual small parameters of atomic physics like smallness of electromagnetic coupling of the electronic shell or smallness of the size of nucleus as compared with the radius of the Bohr orbit the rigorous study of this problem inevitably implies numerical simulation of dark atom interaction with nuclei. Our approach to such simulations of $OHe-$nucleus interaction involves multi-step approximation to the realistic picture by continuous addition to the initially classical picture of three point-like body problem essential quantum mechanical features.

   hep-ph3 citations
5. 05*

   Dark Matter from $SU(6)\to SU(5)\times U(1{)}_N$

   Ernest Ma (UC Riverside)🇺🇸

   Matter and dark matter are unified under the framework of $SU(6)\to SU(5)\times U(1{)}_N$. A dark-matter candidate is possible, not because it is stable, but because it has a very long lifetime, in analogy to that of the proton in theories of grand unification. A specific example is presented.

   hep-phPRD(2021)·5 citations
6. 06*

   Multi-system Bayesian constraints on the transport coefficients of QCD matter

   D. Everett🇺🇸 · W. Ke🇺🇸 · J.-F. Paquet🇺🇸 · G. Vujanovic🇺🇸 · S. A. Bass🇺🇸 · L. Du🇺🇸 · C. Gale🇨🇦 · M. Heffernan🇨🇦 · U. Heinz🇺🇸 · D. Liyanage🇺🇸 · M. Luzum🇧🇷 · A. Majumder🇺🇸 and 36 other authors

   We study the properties of the strongly-coupled quark-gluon plasma with a multistage model of heavy ion collisions that combines the T${}_{\mathrm{R}}$ENTo initial condition ansatz, free-streaming, viscous relativistic hydrodynamics, and a relativistic hadronic transport. A model-to-data comparison with Bayesian inference is performed, revisiting assumptions made in previous studies. The role of parameter priors is studied in light of their importance towards the interpretation of results. We emphasize the use of closure tests to perform extensive validation of the analysis workflow before comparison with observations. Our study combines measurements from the Large Hadron Collider and the Relativistic Heavy Ion Collider, achieving a good simultaneous description of a wide range of hadronic observables from both colliders. The selected experimental data provide reasonable constraints on the shear and the bulk viscosities of the quark-gluon plasma at $T\sim$ 150-250 MeV, but their constraining power degrades at higher temperatures $T\gtrsim 250$ MeV. Furthermore, these viscosity constraints are found to depend significantly on how viscous corrections are handled in the transition from hydrodynamics to the hadronic transport. Several other model parameters, including the free-streaming time, show similar model sensitivity while the initial condition parameters associated with the T${}_{\mathrm{R}}$ENTo ansatz are quite robust against variations of the particlization prescription. We also report on the sensitivity of individual observables to the various model parameters. Finally, Bayesian model selection is used to quantitatively compare the agreement with measurements for different sets of model assumptions, including different particlization models and different choices for which parameters are allowed to vary between RHIC and LHC energies.

   hep-phnucl-exnucl-thPRC(2021)·406 citations
7. 07*

   Primordial Monopoles and Strings, Inflation, and Gravity Waves

   Joydeep Chakrabortty🇮🇳 · George Lazarides🇬🇷 · Rinku Maji🇮🇳 · Qaisar Shafi🇺🇸

   We consider magnetic monopoles and strings that appear in non-supersymmetric $SO(10)$ and $E_6$ grand unified models paying attention to gauge coupling unification and proton decay in a variety of symmetry breaking schemes. The dimensionless string tension parameter $G\mu$ spans the range $10^{-6}-10^{-30}$, where $G$ is Newton's constant and $\mu$ is the string tension. We show how intermediate scale monopoles with mass $\sim 10^{13}-10^{14}$ GeV and flux $\lesssim 2.8\times 10^{-16}$ ${\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}{\mathrm{sr}}^{-1}$, and cosmic strings with $G\mu \sim 10^{-11}-10^{-10}$ survive inflation and are present in the universe at an observable level. We estimate the gravity wave spectrum emitted from cosmic strings taking into account inflation driven by a Coleman-Weinberg potential. The tensor-to-scalar ratio $r$ lies between $0.06$ and $0.003$ depending on the details of the inflationary scenario.

   hep-phhep-thJHEP(2021)·45 citations
8. 08*

   Cálculo de la integral escalar a un lazo $A(m^2)$ mediante el teorema del residuo

   J. D. García-Aguilar🇲🇽 · J. C. Gómez-Izquierdo🇲🇽

   Radiative corrections in the phenomenology of particle physics lead to great predictions on the observables of the Standard Model (SM) which are in good agreement with different measurements on Particle Accelerators and Detectors and in the case of numeric predictions on Quantum Chromodynamics (QCD) and its study in the lattice for the low energy regime. This is a pedagogical paper in which we calculate the one loop scalar integral $A(m^2)$, that arises in the simplest radiative correction calculation, by means of the dimensional regularization. As main result, we perform also the evaluation of this integral by using the Residue Theorem on complex variable. In addition, the equivalence between the two procedures is shown through Gamma function properties.

   hep-phRev.Mex.Fis.E(2021)·0 citations
9. 09*

   Sunrise integral with two internal masses and pseudo-threshold kinematics in terms of elliptic polylogarithms

   Johanna Campert🇨🇭 · Francesco Moriello🇨🇭 · Anatoly Kotikov🇷🇺

   We consider a two-loop sunrise integral with two different internal masses at pseudo-threshold kinematics and we solve it in terms of elliptic polylogarithms to all orders of the dimensional regulator.

   hep-phhep-thJHEP(2021)·24 citations
10. 10*

    The $P_{cs}(4459)$ pentaquark from a combined effective field theory and phenomenological perspective

    Fang-Zheng Peng🇨🇳 · Mao-Jun Yan🇨🇳 · Mario Sánchez Sánchez🇫🇷 · Manuel Pavon Valderrama🇨🇳

    The observation of the $P_{cs}(4459)$ by the LHCb collaboration adds a new member to the set of known hidden-charm pentaquarks, which includes the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. The $P_{cs}(4459)$ is expected to have the light-quark content of a $\Lambda$ baryon ($I=0$, $S=-1$), but its spin is unknown. Its closeness to the ${\bar{D}}^{\ast }{\Xi }_c$ threshold -- $4478\mathrm{MeV}$ in the isospin-symmetric limit -- suggests the molecular hypothesis as a plausible explanation for the $P_{cs}(4459)$. While in the absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two spin-states of the ${\bar{D}}^{\ast }{\Xi }_c$ to be degenerate, power counting arguments indicate that the coupling with the nearby $\bar{D}{\Xi }_c^{\prime }$ and $\bar{D}{\Xi }_c^{\ast }$ channels might be a leading order effect. This generates a hyperfine splitting in which the $J=\frac{3}{2}$ ${\bar{D}}^{\ast }{\Xi }_c$ pentaquark will be lighter than the $J=\frac{1}{2}$ configuration, which we estimate to be of the order of $5-15\mathrm{MeV}$. We also point out an accidental symmetry between the $P_{cs}(4459)$ and $P_c(4440/4457)$ potentials. Finally, we argue that the spectroscopy and the $J/\psi \Lambda$ decays of the $P_{cs}(4459)$ might suggest a marginal preference for $J=\frac{3}{2}$ over $J=\frac{1}{2}$.

    hep-phhep-exhep-latnucl-thEPJC(2021)·101 citations
11. 11*

    Neutrino experiments probe hadrophilic light dark matter

    Yohei Ema🇩🇪 · Filippo Sala🇫🇷 · Ryosuke Sato🇩🇪

    We use Super-K data to place new strong limits on interactions of sub-GeV Dark Matter (DM) with nuclei, that rely on the DM flux inevitably induced by cosmic-ray upscatterings. We derive analogous sensitivities at Hyper-K and DUNE and compare them with others, e.g. at JUNO. Using simplified models, we find that our proposal tests genuinely new parameter space, allowed both by theoretical consistency and by other direct detection experiments, cosmology, meson decays and our recast of monojet. Our results thus motivate and shape a new physics case for any large volume detector sensitive to nuclear recoils.

    hep-phastro-ph.HEhep-exSciPost Phys.(2021)·72 citations
12. 12*

    Absorption of Sub-MeV Fermionic Dark Matter by Electron Targets

    Jeff A. Dror🇺🇸 · Gilly Elor🇺🇸 · Robert McGehee🇺🇸 · Tien-Tien Yu🇺🇸

    We study a new class of signals where fermionic dark matter is absorbed by bound electron targets. Fermionic absorption signals in direct detection and neutrino experiments are sensitive to dark matter with sub-MeV mass, probing a region of parameter space in which dark matter is otherwise challenging to detect. We calculate the rate and energy deposition spectrum in xenon-based detectors, making projections for current and future experiments. We present two possible models that display fermionic absorption by electrons and study the detection prospects in light of other constraints.

    hep-phastro-ph.COhep-exPRD(2021)·58 citations
13. 13*

    Stability of the Higgs Sector in a Flavor-Inspired Multi-Scale Model

    Lukas Allwicher🇨🇭 · Gino Isidori🇨🇭 · Anders Eller Thomsen🇨🇭

    We analyze the stability of the Higgs sector of a three-site model with flavor-non-universal gauge interactions, whose spectrum of non-Standard-Model states spans three orders of magnitude. This model is inspired by deconstructing a five-dimensional theory where the generation index is in one-to-one relation to the position in the fifth dimension. It provides a good description of masses and mixing of the SM fermions in terms of scale hierarchies. We demonstrate that, within this construction, the mass term of the SM-like Higgs does not receive large corrections proportional to the highest mass scales. The model suffers only of the unavoidable "little hierarchy problem" between the electroweak scale and the lightest NP states, which are expected to be at the TeV scale.

    hep-phJHEP(2021)·44 citations
14. 14*

    Analysis Description Languages for the LHC

    Sezen Sekmen🇰🇷 · Philippe Gras🇫🇷 · Lindsey Gray🇺🇸 · Benjamin Krikler🇬🇧 · Jim Pivarski🇺🇸 · Harrison B. Prosper🇺🇸 · Andrea Rizzi🇮🇹 · Gokhan Unel🇺🇸 · Gordon Watts🇺🇸

    An analysis description language is a domain specific language capable of describing the contents of an LHC analysis in a standard and unambiguous way, independent of any computing framework. It is designed for use by anyone with an interest in, and knowledge of, LHC physics, i.e., experimentalists, phenomenologists and other enthusiasts. Adopting analysis description languages would bring numerous benefits for the LHC experimental and phenomenological communities ranging from analysis preservation beyond the lifetimes of experiments or analysis software to facilitating the abstraction, design, visualization, validation, combination, reproduction, interpretation and overall communication of the analysis contents. Here, we introduce the analysis description language concept and summarize the current efforts ongoing to develop such languages and tools to use them in LHC analyses.

    hep-phphysics.comp-phPoS(2021)·6 citations
15. 15*

    NANOGrav results and LIGO-Virgo primordial black holes in axion-like curvaton model

    Keisuke Inomata🇺🇸 · Masahiro Kawasaki🇯🇵 · Kyohei Mukaida🇩🇪 · Tsutomu T. Yanagida🇨🇳

    We discuss a possible connection between the recent NANOGrav results and the primordial black holes (PBHs) for the LIGO-Virgo events. In particular, we focus on the axion-like curvaton model, which provides a sizable amount of PBHs and GWs induced by scalar perturbations around the NANOGrav frequency range. The inevitable non-Gaussianity of this model suppresses the induced GWs associated with PBHs for the LIGO-Virgo events to be compatible with the NANOGrav results. We show that the axion-like curvaton model can account for PBHs for the LIGO-Virgo events and the NANOGrav results simultaneously.

    ↳ astro-ph.COhep-phPRL(2021)·97 citations
16. 16*

    Quantum Simulation of Light-Front Parton Correlators

    M.G. Echevarria🇪🇸 · I.L. Egusquiza🇪🇸 · E. Rico🇪🇸 · G. Schnell🇪🇸

    The physics of high-energy colliders relies on the knowledge of different non-perturbative parton correlators, such as parton distribution functions, that encode the information on universal hadron structure and are thus the main building blocks of any factorization theorem of the underlying process in such collision. These functions are given in terms of gauge-invariant light-front operators, they are non-local in both space and real time, and are thus intractable by standard lattice techniques due to the well-known sign problem. In this paper, we propose a quantum algorithm to perform a quantum simulation of these type of correlators, and illustrate it by considering a space-time Wilson loop. We discuss the implementation of the quantum algorithm in terms of quantum gates that are accessible within actual quantum technologies such as cold atoms setups, trapped ions or superconducting circuits.

    ↳ quant-phcond-mat.mes-hallhep-lathep-ph+1PRD(2021)·48 citations
17. 17*

    Dark matter admixed neutron star properties in the light of gravitational wave observations: a two fluid approach

    Arpan Das🇵🇱 · Tuhin Malik🇮🇳 · Alekha C. Nayak🇮🇳

    We consider the effect of density dependent dark matter on the neutron star mass, radius, and tidal deformability. Nuclear matter (normal matter) as well as the fermionic dark matter sector is considered in a mean field model. We adopt the two fluid formalism to investigate the effect of dark matter on the neutron star properties. In the two fluid picture, there is no direct interaction between the dark matter and the nuclear matter. Rather these two sectors interact only through gravitational interaction. The nuclear matter sector is described by the $\sigma -\omega -\rho$ meson interaction in the "FSU2R" parameterization. In the dark matter sector, we use the Bayesian parameter optimization technique to fix the unknown parameters in the dark matter equation of state. In the two fluid picture, we solve the coupled Tolman-Oppenheimer-Volkoff (TOV) equations to obtain the mass and radius of dark matter admixed neutron stars (DANSs). We also estimate the effect of the density dependent dark matter sector on the tidal deformability of dark matter admixed neutron stars (DANSs).

    ↳ nucl-thastro-ph.HEhep-phPRD(2022)·85 citations
18. 18*

    New insights into the formation and growth of boson stars in dark matter halos

    Jiajun Chen🇩🇪 · Xiaolong Du🇺🇸 · Erik W. Lentz🇩🇪 · David J. E. Marsh🇩🇪 · Jens C. Niemeyer🇩🇪

    This work studies the formation and growth of boson stars and their surrounding miniclusters by gravitational condensation using non-linear dynamical numerical methods. Fully dynamical attractive and repulsive self-interactions are also considered for the first time. In the case of pure gravity, we numerically prove that the growth of boson stars inside halos slows down and saturates as has been previously conjectured, and detail its conditions. Self-interactions are included using the Gross-Pitaevskii-Poisson equations. We find that in the case of strong attractive self-interactions the boson stars can become unstable and collapse, in agreement with previous stationary computations. At even stronger coupling, the condensate fragments. Repulsive self-interactions, as expected, promote boson star formation, and lead to solutions with larger radii.

    ↳ astro-ph.COhep-phPRD(2021)·153 citations
19. 19*

    Deconfinement and Hadron Resonance Gas for Heavy Quarks

    Peter Petreczky🇺🇸

    I discuss the deconfinement transition in 2+1 flavor QCD in terms of Polyakov loops as well as the hadron resonance gas for hadrons containing static quarks and charm quarks.

    ↳ hep-lathep-phnucl-thActa Phys.Polon.Supp.(2021)·2 citations
20. 20*

    Invisible neutrino decay in precision cosmology

    Gabriela Barenboim🇪🇸 · Joe Zhiyu Chen🇦🇺 · Steen Hannestad🇩🇰 · Isabel M. Oldengott🇪🇸 · Thomas Tram🇩🇰 · Yvonne Y. Y. Wong🇦🇺

    We revisit the topic of invisible neutrino decay in the precision cosmological context, via a first-principles approach to understanding the cosmic microwave background and large-scale structure phenomenology of such a non-standard physics scenario. Assuming an effective Lagrangian in which a heavier standard-model neutrino ${\nu }_H$ couples to a lighter one ${\nu }_l$ and a massless scalar particle $\varphi$ via a Yukawa interaction, we derive from first principles the complete set of Boltzmann equations, at both the spatially homogeneous and the first-order inhomogeneous levels, for the phase space densities of ${\nu }_H$, ${\nu }_l$, and $\varphi$ in the presence of the relevant decay and inverse decay processes. With this set of equations in hand, we perform a critical survey of recent works on cosmological invisible neutrino decay in both limits of decay while ${\nu }_H$ is ultra-relativistic and non-relativistic. Our two main findings are: (i) in the non-relativistic limit, the effective equations of motion used to describe perturbations in the neutrino--scalar system in the existing literature formally violate momentum conservation and gauge invariance, and (ii) in the ultra-relativistic limit, exponential damping of the anisotropic stress does not occur at the commonly-used rate ${\Gamma }_{\mathrm{T}}=(1/{\tau }_0)(m_{\nu H}/E_{\nu H}{)}^3$, but at a rate $\sim (1/{\tau }_0)(m_{\nu H}/E_{\nu H}{)}^5$. Both results are model-independent. The impact of the former finding on the cosmology of invisible neutrino decay is likely small. The latter, however, implies a significant revision of the cosmological limit on the neutrino lifetime ${\tau }_0$ from ${\tau }_0^{\mathrm{old}}\gtrsim 1.2\times 10^9\mathrm{s}(m_{\nu H}/50\mathrm{meV}{)}^3$ to ${\tau }_0\gtrsim (4\times 10^5\to 4\times 10^6)\mathrm{s}(m_{\nu H}/50\mathrm{meV}{)}^5$.

    ↳ astro-ph.COhep-phJCAP(2021)·86 citations
21. 21*

    Relativistic non-resistive viscous magnetohydrodynamics from the kinetic theory:a relaxation time approach

    Ankit Kumar Panda🇮🇳 · Ashutosh Dash🇮🇳 · Rajesh Biswas🇮🇳 · Victor Roy🇮🇳

    We derive the relativistic non-resistive, viscous second-order magnetohydrodynamic equations for the dissipative quantities using the relaxation time approximation. The Boltzmann equation is solved for a system of particles and antiparticles using Chapman-Enskog like gradient expansion of the single-particle distribution function truncated at second order. In the first order, the transport coefficients are independent of the magnetic field. In the second-order, new transport coefficients that couple magnetic field and the dissipative quantities appear which are different from those obtained in the 14-moment approximation \cite{Denicol:2018rbw} in the presence of a magnetic field. However, in the limit of the weak magnetic field, the form of these equations are identical to the 14-moment approximation albeit with a different values of these coefficients. We also derive the anisotropic transport coefficients in the Navier-Stokes limit.

    ↳ nucl-thhep-phphysics.flu-dynphysics.plasm-phJHEP(2021)·60 citations
22. 22*

    Instability of de Sitter space under thermal radiation in different vacua

    Jinn-Ouk Gong🇰🇷 · Min-Seok Seo🇰🇷

    We study the instability of de Sitter space-time (dS) under thermal radiation in different vacua. We argue that the mode function solution of a scalar field in four-dimensional dS can be separated into the incoming and outgoing modes. Different vacua for dS are realized by different combinations of positive frequency modes assigned to each solution. For a minimally coupled massless scalar field, we explicitly compute the behavior of the mode function and the corresponding energy-momentum tensor in the Unruh vacuum near the horizon, and find that the horizon area increases (decreases) in time when the incoming (outgoing) mode contributes to thermal flux.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2021)·13 citations
23. 23*

    Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons

    H1 collaboration

    Charged particle multiplicity distributions in positron-proton deep inelastic scattering at a centre-of-mass energy $\sqrt{s}=319$ GeV are measured. The data are collected with the H1 detector at HERA corresponding to an integrated luminosity of $136$ pb${}^{-1}$. Charged particle multiplicities are measured as a function of photon virtuality $Q^2$, inelasticity $y$ and pseudorapidity $\eta$ in the laboratory and the hadronic centre-of-mass frames. Predictions from different Monte Carlo models are compared to the data. The first and second moments of the multiplicity distributions are determined and the KNO scaling behaviour is investigated. The multiplicity distributions as a function of $Q^2$ and the Bjorken variable $x_{\mathrm{Bj}}$ are converted to the hadron entropy $S_{\mathrm{hadron}}$, and predictions from a quantum entanglement model are tested.

    ↳ hep-exhep-phEPJC(2021)·69 citations
24. 24*

    Constraining the primordial black hole scenario with Bayesian inference and machine learning: the GWTC-2 gravitational wave catalog

    Kaze W. K. Wong🇺🇸 · Gabriele Franciolini🇨🇭 · Valerio De Luca🇨🇭 · Vishal Baibhav🇺🇸 · Emanuele Berti🇺🇸 · Paolo Pani🇮🇹 · Antonio Riotto🇨🇭

    Primordial black holes (PBHs) might be formed in the early Universe and could comprise at least a fraction of the dark matter. Using the recently released GWTC-2 dataset from the third observing run of the LIGO-Virgo Collaboration, we investigate whether current observations are compatible with the hypothesis that all black hole mergers detected so far are of primordial origin. We constrain PBH formation models within a hierarchical Bayesian inference framework based on deep learning techniques, finding best-fit values for distinctive features of these models, including the PBH initial mass function, the fraction of PBHs in dark matter, and the accretion efficiency. The presence of several spinning binaries in the GWTC-2 dataset favors a scenario in which PBHs accrete and spin up. Our results indicate that PBHs may comprise only a fraction smaller than $0.3\%$ of the total dark matter, and that the predicted PBH abundance is still compatible with other constraints.

    ↳ gr-qcastro-ph.COhep-phPRD(2021)·157 citations
25. 25*

    Electric dipole moments of three-nucleon systems in the pionless effective field theory

    Zichao Yang🇺🇸 · Emanuele Mereghetti🇺🇸 · Lucas Platter🇺🇸 · Matthias R. Schindler🇺🇸 · Jared Vanasse🇺🇸

    We calculate the electric dipole moments (EDMs) of three-nucleon systems at leading order in pionless effective field theory. The one-body contributions that arise from permanent proton and neutron EDMs and the two-body contributions that arise from CP-odd nucleon-nucleon interactions are taken into account. Neglecting the Coulomb interaction, we consider the triton and ${}^3$He, and also investigate them in the Wigner-SU(4) symmetric limit. We also calculate the electric dipole form factor and find numerically that the momentum dependence of the electric dipole form factor in the Wigner limit is, up to an overall constant (and numerical accuracy), the same as the momentum dependence of the charge form factor.

    ↳ nucl-thhep-phPRC(2021)·10 citations
26. 26*

    New Developments in Flavor Evolution of a Dense Neutrino Gas

    Irene Tamborra🇩🇰 · Shashank Shalgar (Niels Bohr Institute)🇩🇰

    Neutrino-neutrino refraction dominates the flavor evolution in core-collapse supernovae, neutron-star mergers, and the early universe. Ordinary neutrino flavor conversion develops on timescales determined by the vacuum oscillation frequency. However, when the neutrino density is large enough, collective flavor conversion may arise because of pairwise neutrino scattering. Pairwise conversion is deemed to be fast as it is expected to occur on timescales that depend on the neutrino-neutrino interaction energy (i.e., on the neutrino number density) and is regulated by the angular distributions of electron neutrinos and antineutrinos. The enigmatic phenomenon of fast pairwise conversion has been overlooked for a long time. However, because of the fast conversion rate, pairwise conversion may possibly occur in the proximity of the neutrino decoupling region with yet to be understood implications for the hydrodynamics of astrophysical sources and the synthesis of the heavy elements. We review the physics of this fascinating phenomenon and its implications for neutrino-dense sources.

    ↳ astro-ph.HEhep-phnucl-thAnn.Rev.Nucl.Part.Sci.(2021)·249 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.